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I second the walking cane. I carry an old-school wooden cane in any situation where I may have my tools removed from me (I'm never "disarmed").

Keep a can of wasp/hornet spray in the car...it's cheap enough, easy to come by at a grocery store, and it's effective. It's not pepper spray...but well, it's not pepper spray (i.e. nobody can say anything about you having it.)

Those are the basics of what I do when I'm in those locations where I can't carry, or my more traditional tools aren't available to me. I've never found a situation where my walking cane wasn't allowed, and frankly, if anyone makes an issue of it, it can turn into an ADA question real quick.

I feel a little guilty about it, and I've never asked for it, but I've more than once been "escorted" to the front of a line while carrying my cane...